Jack



H. BARON.

JACK.

APPLICATION FILED SEPT. 21. 1920.

Patented Sept. 26, 1922.

2 SHEETS-SHEET 1.

H. BARON.

JACK.

APPLICATION man SEPT. 21. 1920.

1,430,144, Pa untedSept. 26, 1922.

Z SHEETSSHEET 2- Patented Sept, Zfi, i922.

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resin '5 h s time.

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Application filed September a1, 1920. Serial n 411,840.

useful Improvements in Jacks, of which'the following is a specification.

This invention relates to an automatic i lifting device or jack suitable for use in connection with any kind of motor vehicle and intended for raising either the front axle or the back axle or both. at once for the purpose of effecting repairs or relieving the tyres.

This device comprises substantially a support furnished with an endless screw controlled by the motor and worked through the medium of suitable pinions, twoscrews bearing on the ground, the support being fixed to one of the axles of the vehicle which it is thus possible to miss.

The accompanying drawing furnished by way of example illustrates one 01 the methods of carrying out this invention.

' Fig. -1 is a plan view of the whole arrangement.

Fig. 2 is a vertical section thereof.

Figs. 3 to 5 are details.

1 is the support which is fixed by bolts 2 or by clamps to the front axle or to the back axle of the vehicle. I

3 is the endless screw controlled by themotor, for example by means of a flexible gear. This screw is in engagement with the tooth-wheel i mounted on the spindle On this latter a small pinion 6 (Fig. 1) is mounted that is in engagement with a pinion 7 mounted loosely on a spindle 8 fixed in a head 9. This latter can pivot around the spindle 5 and carries a second small pinion 10 in engagement with the pinion 7. According to the position of the head 9 either the pinion 7 or the pinion 10 can be put into engagement with a pinion 11 firmly connected with a pinion 12, that forms a nut on one of the lifting screws 13. The pinion 12 engages with a tooth-wheel 1i loosely mounted on the spindle 5 and in engagement with a pinion 12 of the same diameter as 12 and which forms a nut on the second lifting screw 13 2) The two lifting screws 13 and 13 are united through the cross piece 15 resting on the ground. It will thus be seen that it theendless screw 3 be actuated it will be possible to raise or lower the lifting screws 18 simultaneously according to the position given to the reversing device 9. p

The endless screw 3 can act on the pinion 4 to the right 'or to the'le'lt according to circumstances. It may in fact be mounted either in the bearing 16 or in the symmetrical bearing 16 l 1.)

I On the reversing device 9 a plate 20 is fixed that forms a spring so that its free end can be raised. This free end carries a spindle 21 that runs through the head 9 and carries a stud which canengage in one or the other of the notches formed in the sector 28.

This arrangement serves for fixing the three positions of the head 9 which may be the head 9 when the screws 13 and 13 approach the end of their course in one direction or the other. These screws thus stop automatically at each end of a'course even 1 it the controlling screw 3 continues to turn.

The Figures 3 to 5 illustrate an arrange- =ment of this kind worked by the screw 13*.

The latter is provided with a longitudinal groove 13 in which is a stop 25 and a stop 26 arranged towards the upper and lower ends of the groove; When the screw 13 reaches the end of the upward or downward course these stops act on a stud-27 arranged at one of the ends of a small bent rod 28 the other end etwhioh is connected with a spindle 29 (Fig. 3) fixed in a plate 30. The latter is pivoted at 31 on the support 1 and has two projections 3O and 30 which come below a small plate with raised edges 21 formed or fixed on the spindle 21 that runs through the engaging head 9 so as to form a bolt as described above. The result of this is that it the stud 27 comes against the lower stop 26, the plate 30 pivots around the spindle 31 and the projection 30 rises and raises the small plate 21 and the flexible olate 20 to which it is firmly connected. Owing to this the stud 22 of the bolt 21 comes out of the notch in the sector 23 in which it was engaged and under the action of the pinions'the head 9 pivots around the spindle The small plate 21 follows this movement disengages itself from the projection 80 and the stud 22 pushed by the flexible plate jumps into the notch in the middle of the sector 23 so as to block the head 9 in the position of disengagement.

In the reverse movement the stud 27 is actuated by the upper stop and the plate 30 pivots in the other direction so as to raise the small plate 21 through the projection 30 which thus brings the head 9 into the position of disengagement as in the preceding case.

In order to bring the head 9 into the position of engagement for the upward or the downward movement, it is moved by hand through the medium of a suitable operating device.

A sheet-iron gear-casing (Fig. 2) is fixed on the top of the apparatus and allows the screw 13 to pass.

I claim 1. An automatic lifting device or jack for motor vehicles, characterized in that an endless screw controlled by the motor is in engagement with a tooth-wheel mounted on i a central spindle which carries a small pinion in engagement with another which, in turn, engages with a third, these latter two being loose in a disconnecting head, the movement of which makes it possible to actuate in one direction or the other two liftingscrews each controlled by a pinion that forms a nut and is firmly connected with a pinion which is operated by the one or the other pinion of the uncoupling and reversing head, the two nut-pinions being of equal diameter and each engaging with a tooth-wheel mounted loosely on the central spindle, so that the two lifting screws move together and at the same speed.

2. An automatic lifting device or jack for motor vehicles comprising an endless screw controlled by the motor, a tooth-wheel engaged by said screw and mounted on a central spindle which carries a small pinion, a second small pinion engaging the first pinion, a third small pinion engaging the second pinion, a movable head carrying said second and third mentioned pinions in such manner that by movement of the head, one or other of said pinions may be brought into operative engagement with two interconnected lifting screws or both pinions disengaged therefrom, locking means for retaining said head in any one desired position, and means controlled by stops on one of the lifting screws for releasing said locking means and moving the movable head into that position in which both pinions are disconnected from the lifting screws when said screws approach the end of their upward or downward course.

8. An automatic lifting device or jack for motor vehicles comprising an endless screw controlled by the motor, a toothwheel engaged by said screw and mounted on a central spindle which carries a small pinion, a second small pinion engaging the first pinion, a third small pinion engaging the second pinion, a movable head carrying said second and third mentioned pinions in such manner that by movement of the head, one or other of said pinions may be brought into operative engagement with. two interconnected lifting screws or both pinions disengaged therefrom, spring actuated locking means for retaining said head in any one desired position, a pivoted rocking plate having two projections adapted when actuated to release said locking means and move the head to its inoperative position, and a rod connected to the rocking plate and having a stud arranged to be engaged by either one of two stops provided on one of the lifting screws. 7

In testimony whereof he has aflixed his signature, in presence of two witnesses.

HENRY BARON. l/Vitnessesz P. TALE, J. F. MCGURK. 

